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FX3 GPIO46 is used as PWM output. I refer to excel document attached to the thread
But in this document, with same IO VDD, IOH, Drive strength, different Forced VDD will result in different drive current for GPIO46.
1. What does " forced VDD" mean in the excel file?
2. What is default GPIO drive strength when no CyU3PSetGpioDriveStrength( ) called to set drive strength, 1/4,2/4,3/4 or 1?
3. Is there difference between simple GPIO and complex GPIO in term of drive strength?
Thank you.
Kelly
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USB Superspeed Peripherals
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Hello Kelly,
Apologies for the confusion
Please check the table 9 in the latest FX3 datasheet https://www.cypress.com/file/140296/download
As per the FX3 TRM, the default drive strength will be Half strength as the default value of GCTL_DS register is 2
0 Quarter strength
1 Three quarter strength
2 Half strength
3 Full strength
Rashi
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Hello Kelly,
Please find my comment below
You can refer to table 9 of the FX3 datasheet for the current values for different drive levels
2. What is default GPIO drive strength when no CyU3PSetGpioDriveStrength( ) called to set drive strength, 1/4,2/4,3/4 or 1?
>> Please refer to section 10.4.4 of FX3 TRM. It mentions about the GCTL_DS register. You can also refer to this thread Solved: what is the default state of CyU3PDriveStrengthSta... - Cypress Developer Community
I will get back to you after confirming for the other questions
Rashi
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Rashi,
Thanks.
I am not able to find GPIO current values in data sheet Table 9 . Table 9 is for GPIF ii timing. Please see the screen shot below.
If you help me explain the forced VDD, it would help me a lot .
Regards,
Kelly
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Hello,
Please check the table 9 in the latest FX3 datasheet https://www.cypress.com/file/140296/download
The drive strength of all the GPIO by default will be Three-Quarters
Rashi
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Hello Kelly,
Apologies for the confusion
Please check the table 9 in the latest FX3 datasheet https://www.cypress.com/file/140296/download
As per the FX3 TRM, the default drive strength will be Half strength as the default value of GCTL_DS register is 2
0 Quarter strength
1 Three quarter strength
2 Half strength
3 Full strength
Rashi